短文改错。 下面短文中有10处错误。请在有错误的地方增加，删除或修改某个单词。

问题：

短文改错。

        下面短文中有10处错误。请在有错误的地方增加，删除或修改某个单词。

         增加：在缺词处加一个漏词符号（∧），并在其下面写上该加的词。

         删除：把多余的词用斜线划掉。

         修改：在错的词下划一横线，并在该词下面写上修改后的词。

         注意：

               1.每处错误及其修改均仅限一词。

               2. 只允许修改10处，多者（从第11处起）不计分。

     My spare time is full of interested activities. I read all kinds of books in the reading room

whenever I am free. I learn much in the library than in class in this way. Meanwhile, I participated in

many sports activities, of that my favorite is volleyball. I often play volleyball after the school. Sports

and games keep me healthy and energetic enough to get across a variety of difficulties. Sometime I go

in for social practice with my classmates outside school. Thus, I can gain much social experiences.

Out-of-class activities are quite necessary for our students. Through these activities we can learn many

things can not be learned in class.

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